package com.dave.servicezuul.filtter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

/**
 * Created by mac on 2018/5/18
 * Describes
 */
@Component
public class MyFilter extends ZuulFilter {
    private static Logger log = LoggerFactory.getLogger(MyFilter.class);

    @Override
    public String filterType() {
        //路由生命周期 pre路由之前 routing：路由之时 post： 路由之后 error：发送错误调用
        return "pre";
    }

    @Override
    public int filterOrder() {
        //过滤的顺序
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        //这里可以写逻辑判断，是否要过滤，本文true,永远过滤。
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        //过滤器的具体逻辑。可用很复杂，包括查sql，nosql去判断该请求到底有没有权限访问。
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        log.info(String.format("%s >>> %s", request.getMethod(), request.getRequestURL().toString()));
        Object accessToken = request.getParameter("token");
        if (accessToken == null) {
            log.warn("token is empty");
            ctx.setSendZuulResponse(false);
            ctx.setResponseStatusCode(401);
            try {
                ctx.getResponse().getWriter().write("token is empty");
            } catch (Exception e) {
            }

            return null;
        }
        log.info("ok");
        return null;
    }
}
